Random lurch forward at a red light

m3sexy · 03-03-2016, 03:58 PM

This has happened to me randomly 4 times. While at a red light and my foot is on the brake pedal i felt a random lurch forward like someone nudged me from behind. its DCT and it has happened when im on manual mode and auto. any suggestions guys?

BLuRRYM3 · 03-03-2016, 04:27 PM

Quote:

Originally Posted by m3sexy

This has happened to me randomly 4 times. While at a red light and my foot is on the brake pedal i felt a random lurch forward like someone nudged me from behind. its DCT and it has happened when im on manual mode and auto. any suggestions guys?

It's normal on the stock software. Happened to me when I would brake hard and come to a stop. I got the Dinan DCT flash and it went away.

There's a few threads on it already.

m3sexy · 03-10-2016, 10:15 AM

sorry, im on the GTS tranny tune and eurocharged software.

GabeS · 03-10-2016, 10:22 AM

I wish my car was crazy about racing like yours apparently is!!

NashvegasR · 03-10-2016, 02:20 PM

WAIT ! I posted about this same thing about a month ago re: a new-to-me 2013 M3 coupe with about 16K miles. DCT. Thought I'd been rear-ended, no one was behind me lol.

I had a 2009 M3 convertible for a few years. Also DCT. Never did this one time.

This new 2013 has now done it at least 3 times.

Rainer M · 03-10-2016, 05:56 PM

Same here.
Sometimes the "kick" is not so violent but sometimes the cars is moving a bit.
I have problems with my power train and I record quite a bit of my drives with the m laptimer app.
You can see that the "speed" picks up to 1 mile but the revs of the motor don't budge? All with no throttle applied of course.
Sometimes I wonder what would happen if I wouldn't have my foot on the brake?
Perhaps it's time to file a officially safety complaint to get BMW to look into this.
Anyone if you have BMW apps and the laptimer app and could post a screen shot?

msan · 03-10-2016, 06:14 PM

Quote:

Originally Posted by Rainer M

Same here.
Sometimes the "kick" is not so violent but sometimes the cars is moving a bit.
I have problems with my power train and I record quite a bit of my drives with the m laptimer app.
You can see that the "speed" picks up to 1 mile but the revs of the motor don't budge? All with no throttle applied of course.
Sometimes I wonder what would happen if I wouldn't have my foot on the brake?
Perhaps it's time to file a officially safety complaint to get BMW to look into this.
Anyone if you have BMW apps and the laptimer app and could post a screen shot?

Good question about not having foot on brake when it happens. I always thought the transmission goes into a "neutral" gear at complete standstill....I will try it out. I get the "kick" sometimes.

Rainer M · 03-10-2016, 06:39 PM

Maybe someone can chime in if the dct has a"neutral"
I was always under the impression that there is always a gear selected and the "neutral" is simply both clutches released.
If you have the free laptimer app let it record.

m3sexy · 03-27-2016, 03:18 PM

Quote:

Originally Posted by NashvegasR

WAIT ! I posted about this same thing about a month ago re: a new-to-me 2013 M3 coupe with about 16K miles. DCT. Thought I'd been rear-ended, no one was behind me lol.

I had a 2009 M3 convertible for a few years. Also DCT. Never did this one time.

This new 2013 has now done it at least 3 times.

Yea my 2011 e90 doesnt do the "kick" only my 13 does

msan · 03-27-2016, 05:01 PM

I've been as to replicate once when I was at a stoplight in D2 and clicked my left paddle to switch to S5. The car did a little kick. I could do repeat it but at the next stop light it didn't kick when I did this.

Rainer M · 03-27-2016, 06:21 PM

Yeah. For me it's random.
Most of the time it happens when the motor is cold in the morning and I drive off
If I have to stop right after driving for only a few hundred yards. It can take a while but if the light is red long enough it happens.
But it does happen also after driving for hundreds of miles.
It's random.

Formula156 · 03-27-2016, 08:16 PM

it is OK.. it is just adjusting gears for you nothing to worry about.. all M3's with DCT will do it..

03-03-2016, 03:58 PM	#1
m3sexy Private 11 Rep 86 Posts Drives: 2013 M3 GTS / E90 M3 Join Date: Jan 2015 Location: Toronto iTrader: (0)	Random lurch forward at a red light This has happened to me randomly 4 times. While at a red light and my foot is on the brake pedal i felt a random lurch forward like someone nudged me from behind. its DCT and it has happened when im on manual mode and auto. any suggestions guys?
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03-10-2016, 10:15 AM	#3
m3sexy Private 11 Rep 86 Posts Drives: 2013 M3 GTS / E90 M3 Join Date: Jan 2015 Location: Toronto iTrader: (0)	sorry, im on the GTS tranny tune and eurocharged software.
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03-10-2016, 10:22 AM	#4
GabeS Crazy! 1180 Rep 1,440 Posts Drives: E93 M3/Mk4 Supra/X6M Join Date: Feb 2013 Location: Las Vegas iTrader: (1)	I wish my car was crazy about racing like yours apparently is!! __________________ First "real" widebody M3 ever thread.[url]http://www.m3post.com/forums/showthread.php?p=17461963
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03-10-2016, 02:20 PM	#5
NashvegasR Lieutenant 174 Rep 532 Posts Drives: 2016 M4 F83 Join Date: Dec 2012 Location: Portland, OR iTrader: (4)	WAIT ! I posted about this same thing about a month ago re: a new-to-me 2013 M3 coupe with about 16K miles. DCT. Thought I'd been rear-ended, no one was behind me lol. I had a 2009 M3 convertible for a few years. Also DCT. Never did this one time. This new 2013 has now done it at least 3 times.
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03-10-2016, 05:56 PM	#6
Rainer M Private First Class 51 Rep 154 Posts Drives: E93 M3, 2018 X5 35D Join Date: Jun 2015 Location: Santa Rosa, CA iTrader: (0)	Same here. Sometimes the "kick" is not so violent but sometimes the cars is moving a bit. I have problems with my power train and I record quite a bit of my drives with the m laptimer app. You can see that the "speed" picks up to 1 mile but the revs of the motor don't budge? All with no throttle applied of course. Sometimes I wonder what would happen if I wouldn't have my foot on the brake? Perhaps it's time to file a officially safety complaint to get BMW to look into this. Anyone if you have BMW apps and the laptimer app and could post a screen shot?
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03-10-2016, 06:39 PM	#8
Rainer M Private First Class 51 Rep 154 Posts Drives: E93 M3, 2018 X5 35D Join Date: Jun 2015 Location: Santa Rosa, CA iTrader: (0)	Maybe someone can chime in if the dct has a"neutral" I was always under the impression that there is always a gear selected and the "neutral" is simply both clutches released. If you have the free laptimer app let it record.
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03-27-2016, 05:01 PM	#10
msan Major 404 Rep 1,171 Posts Drives: 2011 E90 M3 / 2012 X5 35i M Sp Join Date: May 2015 Location: Los Angeles, CA iTrader: (16)	I've been as to replicate once when I was at a stoplight in D2 and clicked my left paddle to switch to S5. The car did a little kick. I could do repeat it but at the next stop light it didn't kick when I did this.
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03-27-2016, 06:21 PM	#11
Rainer M Private First Class 51 Rep 154 Posts Drives: E93 M3, 2018 X5 35D Join Date: Jun 2015 Location: Santa Rosa, CA iTrader: (0)	Yeah. For me it's random. Most of the time it happens when the motor is cold in the morning and I drive off If I have to stop right after driving for only a few hundred yards. It can take a while but if the light is red long enough it happens. But it does happen also after driving for hundreds of miles. It's random.
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03-27-2016, 08:16 PM	#12
Formula156 Enlisted Member 27 Rep 41 Posts Drives: 2011 BMW M3 Slverstone Join Date: Feb 2015 Location: Orlando FL iTrader: (0)	it is OK.. it is just adjusting gears for you nothing to worry about.. all M3's with DCT will do it..
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